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- Dictionaryport wine stain/pôrt wīn stān/
noun
- 1. a kind of large, deep red birthmark, a persistent hemangioma or nevus, typically on the face.
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noun
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A port-wine stain (nevus flammeus) is a discoloration of the human skin caused by a vascular anomaly (a capillary malformation in the skin). They are so named for their coloration, which is similar in color to port wine, a fortified red wine from Portugal. A port-wine stain is a capillary malformation, seen at birth. Port-wine stains persist throughout life. The area of skin affected grows in prop... Wikipedia